About this item

• Product Overview
  Compare Motor Oil

  Compare Motor Oil

  

  	Signature Series	Extended-Life (XL)	High-Mileage	Hybrid	OE
  Wear Protection
  Engine Cleanliness
  Service Interval
  Extreme Temp Performance
  Corrosion Protection
  Oil-Consumption Control
  Viscosity Control
  Leak Protection
  Severe-Service Protection

  View Full Image

  Preventive maintenance that includes high-quality lubricants is key for keeping vehicles safe and dependable for the long haul. AMSOIL 100% Synthetic High-Mileage Motor Oil is designed specifically for the unique demands of high-mileage engines, helping extend the life of your vehicle. It delivers purpose-built protection at a time in your vehicle’s life where it could benefit from more-robust maintenance. It cleans and protects engines with boosted detergency and an additive package that fights oil breakdown and oil leaks.

  See the Product Data Bulletin for full details.

  ENGINE CLEANLINESS

  • Enhanced detergency to breathe new life into dirty engines.
  • Removes deposit buildup to help restore peak performance.

  SLUDGE REDUCTION

  AMSOIL 100% Synthetic High-Mileage Motor Oil reduced sludge by 67%, ^VV demonstrating its cleaning power that helps engines last longer and perform better.

  

  	0 Hours	134 Hours	158 Hours	178 Hours	Oil changed to AMSOIL 0W-20 High-Mileage Motor Oil	208 Hours	229 Hours	252 Hours	272 Hours
  Total Engine Sludge Rating	0	1.85	2.25	3.12		1.9	1.44	1.4	1

  ^VVBased on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil using a modified Sequence VH Test (ASTM D8256).

  DEPOSIT REDUCTION

  AMSOIL 100% Synthetic High-Mileage Motor Oil provides up to 62% better deposit prevention.^WW1

  

  	AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil	Valvoline* Full Synthetic High Mileage with MaxLife* Technology 0W-20 Motor Oil	Mobil 1* High Mileage 0W-20 Full Synthetic Motor Oil
  Total Deposits (mg)	15.4	39.3	40.5

  ^WW1Based on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil, Valvoline* Full Synthetic High-Mileage with MaxLife* Technology 0W-20 Motor Oil (batch codeJ2622C5 purchased December 21, 2022) and Mobil 1* High-Mileage 0W-20 Full Synthetic Motor Oil (batch code 11022L21A 6606 purchased December 8, 2022) in the industry-standard TEOST 33C Test (ASTM D6335) as required by the ILSAC GF-6 specification.
  *All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

  DURABLE VISCOSITY

  • Maintains proper film thickness in extreme operation.

  OIL-CONSUMPTION CONTROL

  • Thermally stable across a wide range of temperatures.
  • Resists volatility and oil consumption.

  LEAK PROTECTION

  • Conditions seals to help prevent leaks.

  API LICENSED

  • Licensed by the American Petroleum Institute (API) to meet and exceed requirements commonly found in owner’s manuals.
• Technical Specifications
  SDS

  SDS

  Data Bulletin

  Data Bulletins

  Warranty

  Warranty

  
  
  
• Product Reviews
  5 star rating

  Based on 397 reviews

  Based on 397 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Great Product
    By  ARMANDO,  a  Verified Buyer  from  Apple Valley CA 92307  on  June 02, 2026

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    This was my first time using Amsoil in my Lexus ES350, and I was impressed by how quiet and smooth my engine ran as I conducted a road test after changing the oil. I have always used Mobil One and decided to try Amsoil. Anyway, I am impressed so far, and if all goes well, I will use the same oil in my 2019 Lexus RX350
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Fantastic stuff
    By  DON,  a  Verified Buyer  from  Missouri  on  June 01, 2026

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    My truck runs so much smoother and quietly with it vs the Kendall oil i was running in it before.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    First time using "High Mileage" oil
    By  DAVE,  a  Verified Buyer  from  Near Austin TX  on  June 01, 2026

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    I have a 2008 F150 with 160K and a 2014 Navigator with 130K on them. I've been using the Amsoil Signature on them in the past, but thought it would be time to try the High Milage oil at about the same price. I doubt I'll notice a difference but I'll sleep better at night.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great product
    By  MIKE,  a  Verified Buyer  from  WA ST  on  May 31, 2026

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    I have been running this in my 2013 Ram 1500 with the 5.7 Hemi. Right at 135,000 miles and The engine runs great with zero oil loss over 5000 mile changes. I’ve have used Amsoil in this Engine and never had any issues.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

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  • 5 star rating
    Easy does it
    By  CALVIN,  a  Verified Buyer  from  Zuni  on  May 21, 2026

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    Great product, package comes complete with your oil change.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

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  • 5 star rating
    Great Oil
    By  KEVIN,  a  Verified Buyer  on  May 15, 2026

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    I have used Amsoil products over 40 years and have nothing but praise for their products. I gave my son in law a truck with 265k miles and he had his mechanic go through everything. The Engine compression test made the mechanic question if the engine was original because it showed minimal wear for the high mileage. The differential was quite and showed minimal wear. If you convert to Amsoil after the 1st 5k your engine will last a very long time & maintain its performance. I changed the differential after the 1st oil change also. Back in the aspirated carb days we used the foam regularly to keep it clean. We used to buy litte old lady cars and bring them back to life after a foam treatment. Kudos for making great stuff.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Excellent Service
    By  CAROLINE,  a  Verified Buyer  from  Staples Minnesota   on  May 12, 2026

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    Love the product! Love that it always comes earlier than it says!
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Third time's the charm
    By  DAVID,  a  Verified Buyer  on  May 09, 2026

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    The oil is awesome, but the shipping was an issue my past two orders. This order was FINALLY correct.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (1)
  • 5 star rating
    Third time's the charm
    By  DAVID,  a  Verified Buyer  on  May 09, 2026

    Open report issue form

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    The oil is awesome, but the shipping was an issue my past two orders. This order was FINALLY correct.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Best oil
    By  RUDOLPH,  a  Verified Buyer  from  California  on  May 05, 2026

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    I use it all my cars
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

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• Highlights

  • Unique chemistry for vehicles with over 75,000 miles
  • Boosted detergent and dispersant package
  • Enhanced anti-wear additives
  • Reduced sludge by 67%,^VV demonstrating cleaning power that helps engines last longer and perform better
  • Guaranteed Protection For 12,000 Miles/1-Year¹
  • API Licensed

  ¹Normal Service – Up to 12,000 miles or one year, whichever comes first, in personal vehicles not operating under severe service.

• Returns

  We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.

• Payments

  We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.

• Product Overview
  Compare Motor Oil

  Compare Motor Oil

  

  	Signature Series	Extended-Life (XL)	High-Mileage	Hybrid	OE
  Wear Protection
  Engine Cleanliness
  Service Interval
  Extreme Temp Performance
  Corrosion Protection
  Oil-Consumption Control
  Viscosity Control
  Leak Protection
  Severe-Service Protection

  View Full Image

  Preventive maintenance that includes high-quality lubricants is key for keeping vehicles safe and dependable for the long haul. AMSOIL 100% Synthetic High-Mileage Motor Oil is designed specifically for the unique demands of high-mileage engines, helping extend the life of your vehicle. It delivers purpose-built protection at a time in your vehicle’s life where it could benefit from more-robust maintenance. It cleans and protects engines with boosted detergency and an additive package that fights oil breakdown and oil leaks.

  See the Product Data Bulletin for full details.

  ENGINE CLEANLINESS

  • Enhanced detergency to breathe new life into dirty engines.
  • Removes deposit buildup to help restore peak performance.

  SLUDGE REDUCTION

  AMSOIL 100% Synthetic High-Mileage Motor Oil reduced sludge by 67%, ^VV demonstrating its cleaning power that helps engines last longer and perform better.

  

  	0 Hours	134 Hours	158 Hours	178 Hours	Oil changed to AMSOIL 0W-20 High-Mileage Motor Oil	208 Hours	229 Hours	252 Hours	272 Hours
  Total Engine Sludge Rating	0	1.85	2.25	3.12		1.9	1.44	1.4	1

  ^VVBased on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil using a modified Sequence VH Test (ASTM D8256).

  DEPOSIT REDUCTION

  AMSOIL 100% Synthetic High-Mileage Motor Oil provides up to 62% better deposit prevention.^WW1

  

  	AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil	Valvoline* Full Synthetic High Mileage with MaxLife* Technology 0W-20 Motor Oil	Mobil 1* High Mileage 0W-20 Full Synthetic Motor Oil
  Total Deposits (mg)	15.4	39.3	40.5

  ^WW1Based on independent testing of AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil, Valvoline* Full Synthetic High-Mileage with MaxLife* Technology 0W-20 Motor Oil (batch codeJ2622C5 purchased December 21, 2022) and Mobil 1* High-Mileage 0W-20 Full Synthetic Motor Oil (batch code 11022L21A 6606 purchased December 8, 2022) in the industry-standard TEOST 33C Test (ASTM D6335) as required by the ILSAC GF-6 specification.
  *All trademarked names are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

  DURABLE VISCOSITY

  • Maintains proper film thickness in extreme operation.

  OIL-CONSUMPTION CONTROL

  • Thermally stable across a wide range of temperatures.
  • Resists volatility and oil consumption.

  LEAK PROTECTION

  • Conditions seals to help prevent leaks.

  API LICENSED

  • Licensed by the American Petroleum Institute (API) to meet and exceed requirements commonly found in owner’s manuals.
• Technical Specifications
  SDS

  SDS

  Data Bulletin

  Data Bulletins

  Warranty

  Warranty

  
  
  
• Product Reviews
  5 star rating

  Based on 397 reviews

  Based on 397 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Great Product
    By  ARMANDO,  a  Verified Buyer  from  Apple Valley CA 92307  on  June 02, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This was my first time using Amsoil in my Lexus ES350, and I was impressed by how quiet and smooth my engine ran as I conducted a road test after changing the oil. I have always used Mobil One and decided to try Amsoil. Anyway, I am impressed so far, and if all goes well, I will use the same oil in my 2019 Lexus RX350
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Fantastic stuff
    By  DON,  a  Verified Buyer  from  Missouri  on  June 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    My truck runs so much smoother and quietly with it vs the Kendall oil i was running in it before.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    First time using "High Mileage" oil
    By  DAVE,  a  Verified Buyer  from  Near Austin TX  on  June 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have a 2008 F150 with 160K and a 2014 Navigator with 130K on them. I've been using the Amsoil Signature on them in the past, but thought it would be time to try the High Milage oil at about the same price. I doubt I'll notice a difference but I'll sleep better at night.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great product
    By  MIKE,  a  Verified Buyer  from  WA ST  on  May 31, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have been running this in my 2013 Ram 1500 with the 5.7 Hemi. Right at 135,000 miles and The engine runs great with zero oil loss over 5000 mile changes. I’ve have used Amsoil in this Engine and never had any issues.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Easy does it
    By  CALVIN,  a  Verified Buyer  from  Zuni  on  May 21, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great product, package comes complete with your oil change.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great Oil
    By  KEVIN,  a  Verified Buyer  on  May 15, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have used Amsoil products over 40 years and have nothing but praise for their products. I gave my son in law a truck with 265k miles and he had his mechanic go through everything. The Engine compression test made the mechanic question if the engine was original because it showed minimal wear for the high mileage. The differential was quite and showed minimal wear. If you convert to Amsoil after the 1st 5k your engine will last a very long time & maintain its performance. I changed the differential after the 1st oil change also. Back in the aspirated carb days we used the foam regularly to keep it clean. We used to buy litte old lady cars and bring them back to life after a foam treatment. Kudos for making great stuff.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Excellent Service
    By  CAROLINE,  a  Verified Buyer  from  Staples Minnesota   on  May 12, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Love the product! Love that it always comes earlier than it says!
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Third time's the charm
    By  DAVID,  a  Verified Buyer  on  May 09, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    The oil is awesome, but the shipping was an issue my past two orders. This order was FINALLY correct.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (1)
  • 5 star rating
    Third time's the charm
    By  DAVID,  a  Verified Buyer  on  May 09, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    The oil is awesome, but the shipping was an issue my past two orders. This order was FINALLY correct.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Best oil
    By  RUDOLPH,  a  Verified Buyer  from  California  on  May 05, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I use it all my cars
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)